How to Document Physical Examination Findings for Onychomycosis
Document the clinical subtype first, then systematically describe the specific nail changes including location, color, texture, and extent of involvement. This structured approach ensures accurate diagnosis and guides appropriate treatment selection.
Essential Documentation Framework
1. Identify and Document the Clinical Pattern
The British Association of Dermatologists guidelines 1 define five main clinical patterns that should be explicitly stated in your documentation:
Distal and Lateral Subungual Onychomycosis (DLSO) - Most common presentation
- Document: Thickened nail plate, discoloration, degree of onycholysis (separation of nail plate from nail bed)
- Note: Distal or lateral margin involvement
- Specify: Toenails vs fingernails affected
Superficial White Onychomycosis (SWO)
- Document: Crumbling white lesions on nail surface
- Note: Whether lesions appear as linear bands from proximal nail fold
- Specify: Extent of nail plate involvement
Proximal Subungual Onychomycosis (PSO)
- Document: Proximal nail involvement with distal portion remaining normal initially
- Note: White discoloration starting at proximal margin
- Critical caveat: PSO is common in AIDS patients and may indicate HIV infection 1
Total Dystrophic Onychomycosis (TDO)
- Document: Near-complete destruction of nail plate
- Note: Gross thickening and hyperkeratosis
- Important: Consider immunocompromised status if present 1
Candidal Onychomycosis - Document separately 1
- Chronic paronychia: Swelling of posterior nail fold, detached cuticle, proximal nail dystrophy
- Note: Fingernails more commonly affected than toenails
- Document: Presence of erythema, pain on nail pressure/movement
2. Specific Physical Findings to Document
Color Changes:
- Yellow, white, green, or black discoloration
- Location and pattern of discoloration
Structural Changes:
- Nail plate thickening (subungual hyperkeratosis)
- Onycholysis (document extent and location)
- Nail plate friability or crumbling
- Sharp, dystrophic edges
Surface Changes:
- Longitudinal or transverse furrowing
- Pitting
- Loss of nail plate luster
Periungual Findings:
- Paronychia (swelling, erythema of nail folds)
- Cuticle detachment
- Presence of pain or tenderness
3. Quantify Disease Severity
Document:
- Number of nails affected
- Percentage of each nail plate involved
- Presence of matrix involvement
- Functional impairment (pain, difficulty with footwear, walking difficulties) 1
4. Document Associated Findings
Risk Factors Present:
- Tinea pedis or other dermatophyte infections
- Psoriasis or other nail diseases 1
- Immunocompromised status
- Occupational exposures (wet work for Candida) 1
- Vascular insufficiency or Raynaud phenomenon (for distal Candida infection) 1
Dermoscopic Findings (if available) 2, 3:
- White flocculation (87% sensitivity)
- Longitudinal nail pattern (83% sensitivity)
- Jagged changes in distal nail plate (79% sensitivity)
- Yellow staining (53% sensitivity)
- Spiked pattern
- Subungual hyperkeratosis
5. Critical Documentation Pitfalls to Avoid
Do not assume fungal infection based on appearance alone - approximately 50% of dystrophic nails are NOT fungal 1. Document that laboratory confirmation is needed.
Differentiate from mimickers 1:
- Psoriasis: typically has pitting, oil spots, salmon patches
- Trauma: nail bed appears normal with intact longitudinal ridges
- Bacterial infection (Pseudomonas): green/black discoloration
- Lichen planus: thinning, pterygium formation
Document functional impact 1:
- Pain or discomfort (present in ~50% of patients)
- Difficulty wearing footwear (~30% of patients)
- Walking difficulties
- Psychosocial impact
6. Sample Documentation Template
"Physical examination reveals [clinical pattern type] affecting [number] nails of [hands/feet]. The [specific nail location] demonstrates [color] discoloration involving [percentage]% of the nail plate, with [presence/absence] of onycholysis measuring [extent]. Nail plate shows [thickening/friability/other changes]. Subungual hyperkeratosis is [present/absent]. Periungual tissues show [normal/paronychia/other findings]. Patient reports [functional limitations]. Differential diagnosis includes onychomycosis, [other conditions]. Laboratory confirmation with [KOH/culture/PCR/histopathology] recommended prior to treatment initiation."
The key principle: Always document findings systematically using the recognized clinical classification system, as this directly impacts treatment selection and prognosis 1. Laboratory confirmation should be explicitly noted as pending or completed, as clinical diagnosis alone has insufficient accuracy for treatment decisions 4, 5.